Rotary pivoted hammer



Jan. 3,1928. 1,655,238

H. M. PLAISTED ROTARY PI VOTED HAMMER Filed Jan. 17, 1927 a ChromePatented Jan. 3, 1928.

UNITED STATES HAROLD M. PLAISTED, OF ST. LOUIS, MISSOURI.

ROTARY PIVOTED' HAMMER.

Application filed January 17, 1927.

This invention relates to certain new and useful improvements in rotarypivoted hammers for crushers and pulverizers operating on coal, shaleand other suitable material, the peculiarities of which will behereinafter described and claimed.

The main object of my invention is to provide a rotary pivoted hammerhaving twelve grinding edges adapted to be adjusted successively inoperative position, for use in Crushers, pulverizers and like machinesoperating on coal, shale and other suitable material. Secondly, toprovide means to effect such adjustment; and thirdly, to provide meansfor effecting a shearing action by said operative edges successively.

In crushing and pulverizing hard abrasive materials, the wear on thegrinding edge of a rotary pivoted hammer, incapacitates this part of thehammer long before the eye or other part wears enough to make itinefficient. Hammers have been made with double edge and reversible onthe hammer rod; also detachable tips or heads have been made with two,four, six and eight grinding edges, respectivelyeach edge successivelypresented as the operative edge,-whereby several tips may be usedsuccessively on one shank before the latter requires to be replaced. Thegrinding tip constitutes a small fraction of the cost of such a hammer,so that a very considerable saving in cost of operation is effected.These former tips are flat and thin, or are rectangular blocks, ortriangular pyramids or other form, but are changed from their commonsimple form by holes, recesses, notches, etc., for rivets, bolts, keys,clamps, etc., fastening such forms as modified for mounting on thehammer shank.

In the accompanying drawing on which like reference numerals indicatecorrespondign parts, Fig. 1 represents a front view of a hammerexemplifying myinvention; Fig. 2, a side view of the same; Fig. 3, aside view of the shank of such a hammer, with parts mounted thereonshown in section;

Fig. at, a detail view of the preferred form of my block having twelvegrinding edges; Fig. 5, a plan viewof Fig. 2; Fig. 6, a top view of theshank only as shown in Fig. 3; and Fig. 7 a top View similar to Fig. 6,but showing means for effecting a shearing action by the operative edgeof said block.

The numeral 1 designates the rectangular shank of a rotary pivotedhammer provided Wither]. opening by wlr it pirated Serial No. 181,551.

the usual hammer rod of a crusher or pulverizer. The operative edge of apivoted hammer is located at the extreme distance from the pivot, and Ihave provided herein a block having twe ve grinding edges, each of whichcan be presented in such operative position by adjustable mounting ofthe same upon a shank. The preferred form of my twelve-edged block isthat of a cube, the six faces of which meet in twelve edges ofsubstantially equal length and form rightangle grinding edges in theform illustrated herewith. I do not confine myself to a cube for mytwelve-edged block but illustrate it herewith.

I do not claim a cube simply per se, but as modified by intersectingthrough passages substantially as described.

Any suitable means for mounting my block with twelve grinding edges uponthe shank may be employed, but I have shown a preferred form asconsisting of a base 3 at the outer end of the shank and having a stem lextending backward in the direction of rotation of the hammer, so as tobring one of the grinding edges of said block into the position 5 foritsoperative position above described. The said stem is preferablycylindrical and I have provided corresponding cylindrical passages 6through the center of the block and intersecting at the center. Near thebase of the stem are surfaces meeting to form angular projections 7 fromthe general contour of the stem and these pro jectionsare adapted toengage corresponding angular recesses in each face of the block thatrests upon the base 3 in the various adjustments. The stem is providedwith a fillet 9 as shown in the drawing and a corresponding surface 10is formed on the matching faces of the block.

Through the said stem, preferably in the plane of rotation 19, is passeda key 11 by means of suitable keyway in the stem which is preferablytapering backward as shown in Fig. 3. This key is provided at its frontend with a guard-plate l2, integral therewith or otherwise, which coversthe front face of the block except aportion 13 adjacent to the operativeedge 5. The key is secured in position by a cotter 14 passing through anopening 15 at the rear end of the key which projects beyond a back plate16 that guards the rear edges of the block. The tapering key bearsagainst the outer 17 of the keyway the block block on' the stem, andmaintain the operative edge in'its preferred position at right angles tothe plane of rotation 19, Fig. 1, and Fig. 6. The block may be readilyadjusted by'withdrawing the key and; raising the, block from theengagement of the angular projections and then rotating it upon thest'em'axis 20. It is evident that the tour grinding edges on the face ofthe block'furthest from the pivot, can thus be rotated successively intothe operative position 5, and maintained in such adjusted position bythe key and angular projections before described. WVhen these fourgrinding edges just mentioned are worn, the block may be reverseduponthe stem so as to bring the opposite face into the extreme position,and these four grinding edges by successive adjustments can be presentedin the said 0perative position. In order to bring the remaining foursurfaces into outer position so as'to present the remaining fourgrinding edges in operative position, the block is removed from the stemand the stem is in-' i serted 111 an intersecting passage at rightangles with the one previously used. This will allow of locating theblock so that the faces that were temporarily the side faces (that is,connecting the top and bottom faces of the block in Fig. 2,) can bebrought to the outer extreme position at the top of the stem, and byadjustment each of the remaining edges becomes the operative edge.

In each adjustment the key passes through the stem and one of theintersecting passages to maintain the operative edge in its adjustedposition. 7

As before stated, the keywaythrough the stem is preferably in the planeof rotation 19. In Fig. 7 I show a-keyway 17 which is inclined to saidplane and so are the corresponding angular projections at the base ofthe stem; M;

, e grinding block when mounted upon suc 1 stem as just described,

-wi-l l cause the operative edge to be inclined or slanting with regardto the plane of rotation as indicated by the dash line'5 in Fig. (7." Ashearing action is thus obtained by the grinding edge, in place of thepro sentation of the operative edge at right angles' to said plane asindicated by dash lines inFig. 6. The base-plate 3 Fig. 7, is alsopreferably slanted as shown, to agree with the slanting position of thegrinding block on the stem.

I claim:

1. In a rotary pivoted hammer, a block having twelve grinding edges andintersecting through passages, substantially as described.

2. In a rotary pivoted hammer, a cubical block having twelve grindingedges and cylindrical intersecting through passages. substantially asdescribed.

3.. In a rotary pivoted hammer, a. block having twelve grinding edgesand in. erseeting through passages provided with surfaces formingangular recesses, substantially as described. Y

4. In a rotary pivoted hammer, a cubical lock having twelve grindingedges and cylindrical intersecting through passages providedwithsurfaces forming recessed-angles at each end, substantially asdescribed.

In arotary pivoted hammer, a cubical block having twelve grinding edgesand six faces and'multiple intersecting through pas sages, substantiallyas described.

' 6. A rotary pivoted hammer comprising a shank, an adjustable blockhaving twelve grinding edges, and means to maintain each edgesuccessively in operative-position.

7. A rotary pivoted hammer comprising a shank, an adjustable cubicalblock having twelve grinding edges,- and means to maintain each edgesuccessively in operative position. V V

8; A rotary pivoted" hammer comprising a shank having astem at the top,a block having twelve grinding edges adjustably mounted on said stem andadapted to present each edge successively in operative position, andfastening means for said block in each adjusted position.

9. A rotary pivoted hammer comprising a shank having a-steni inclinedbackward, a block havingtwelve grinding edges adjustably mounted" onsaid stem, and means to secure said block on said stem in anyadjustedposition;

10. A rotary pivoted hammer comprising a shank havinga cylindrical stemprovided with project-ions near its-base, a block hav ing multiplegrinding edges adjustably mounted on said stem and having recesses ineach face adapted to engage said projections in-any adjusted positionofsaid block.

11. A rotary pivoted hammer comprising shanlha'ving a stem provided witha keyway, an adjustable block having twelve grinding edges andintersecting through passages adapted tomatch said stem in any adjustedpositioma-nd a'key passing through said stem and one of said passages ineach adjustment of saidblock. V 12'. A rotary pivoted hammer comprisinga shank having a base andstem with akeyway, a block having twelvegrinding edges and intersecting through passages adjustably mounted onsaid stem and base and 10 to the plane of rotation, a block havingmultiple grindin edges adjustably mounted on said stem an adapted topresenteach edge successively in operative position and having angularrecesses adapted to match said projections and slant the operative edgeto the plane of rotation in any adjusted position, substantially asdescribed.

In testimony whereof I have aifixed my signature.

HAROLD M. PLAISTED.

